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From: <sean.wang@mediatek.com>
To: <nbd@nbd.name>, <lorenzo.bianconi@redhat.com>
CC: <sean.wang@mediatek.com>, <Soul.Huang@mediatek.com>,
<YN.Chen@mediatek.com>, <Leon.Yen@mediatek.com>,
<Eric-SY.Chang@mediatek.com>, <Deren.Wu@mediatek.com>, <km.lin@mediatek.com>,
<robin.chiu@mediatek.com>, <ch.yeh@mediatek.com>, <posh.sun@mediatek.com>,
<Eric.Liang@mediatek.com>, <Stella.Chang@mediatek.com>, <jemele@google.com>,
<yenlinlai@google.com>, <linux-wireless@vger.kernel.org>,
<linux-mediatek@lists.infradead.org>
Subject: [PATCH v2] mt76: mt7921: fix kernel warning from
cfg80211_calculate_bitrate
Date: Sat, 14 Aug 2021 02:09:18 +0800
From: Sean Wang <sean.wang@mediatek.com>
Fix the kernel warning from cfg80211_calculate_bitrate
due to the legacy rate is not parsed well in the current driver.
Also, zeros struct rate_info before we fill it out to avoid the old value
is kept such as rate->legacy.
[ 790.921560] WARNING: CPU: 7 PID: 970 at net/wireless/util.c:1298 cfg80211_calculate_bitrate+0x354/0x35c [cfg80211]
[ 790.987738] Hardware name: MediaTek Asurada rev1 board (DT)
[ 790.993298] pstate: a0400009 (NzCv daif +PAN -UAO)
[ 790.998104] pc : cfg80211_calculate_bitrate+0x354/0x35c [cfg80211]
[ 791.004295] lr : cfg80211_calculate_bitrate+0x180/0x35c [cfg80211]
[ 791.010462] sp : ffffffc0129c3880
[ 791.013765] x29: ffffffc0129c3880 x28: ffffffd38305bea8
[ 791.019065] x27: ffffffc0129c3970 x26: 0000000000000013
[ 791.024364] x25: 00000000000003ca x24: 000000000000002f
[ 791.029664] x23: 00000000000000d0 x22: ffffff8d108bc000
[ 791.034964] x21: ffffff8d108bc0d0 x20: ffffffc0129c39a8
[ 791.040264] x19: ffffffc0129c39a8 x18: 00000000ffff0a10
[ 791.045563] x17: 0000000000000050 x16: 00000000000000ec
[ 791.050910] x15: ffffffd3f9ebed9c x14: 0000000000000006
[ 791.056211] x13: 00000000000b2eea x12: 0000000000000000
[ 791.061511] x11: 00000000ffffffff x10: 0000000000000000
[ 791.066811] x9 : 0000000000000000 x8 : 0000000000000000
[ 791.072110] x7 : 0000000000000000 x6 : ffffffd3fafa5a7b
[ 791.077409] x5 : 0000000000000000 x4 : 0000000000000000
[ 791.082708] x3 : 0000000000000000 x2 : 0000000000000000
[ 791.088008] x1 : ffffff8d3f79c918 x0 : 0000000000000000
[ 791.093308] Call trace:
[ 791.095770] cfg80211_calculate_bitrate+0x354/0x35c [cfg80211]
[ 791.101615] nl80211_put_sta_rate+0x6c/0x2c0 [cfg80211]
[ 791.106853] nl80211_send_station+0x980/0xaa4 [cfg80211]
[ 791.112178] nl80211_get_station+0xb4/0x134 [cfg80211]
[ 791.117308] genl_rcv_msg+0x3a0/0x440
[ 791.120960] netlink_rcv_skb+0xcc/0x118
[ 791.124785] genl_rcv+0x34/0x48
[ 791.127916] netlink_unicast+0x144/0x1dc
Fixes: 1c099ab44727 ("mt76: mt7921: add MCU support")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
v2: don't do unnecessary line removal
---
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index cadb633639d3..9b35b5da3619 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -328,11 +328,13 @@ mt7921_mcu_tx_rate_parse(struct mt76_phy *mphy,
struct rate_info *rate, u16 r)
{
struct ieee80211_supported_band *sband;
- u16 flags = 0;
+ u16 flags = 0, rate_idx;
u8 txmode = FIELD_GET(MT_WTBL_RATE_TX_MODE, r);
u8 gi = 0;
u8 bw = 0;
+ bool cck = false;
+ memset(rate, 0, sizeof(*rate));
rate->mcs = FIELD_GET(MT_WTBL_RATE_MCS, r);
rate->nss = FIELD_GET(MT_WTBL_RATE_NSS, r) + 1;
@@ -357,13 +359,18 @@ mt7921_mcu_tx_rate_parse(struct mt76_phy *mphy,
switch (txmode) {
case MT_PHY_TYPE_CCK:
+ cck = true;
+ fallthrough;
case MT_PHY_TYPE_OFDM:
if (mphy->chandef.chan->band == NL80211_BAND_5GHZ)
sband = &mphy->sband_5g.sband;
else
sband = &mphy->sband_2g.sband;
- rate->legacy = sband->bitrates[rate->mcs].bitrate;
+ rate_idx = FIELD_GET(MT_TX_RATE_IDX, r);
+ rate_idx = mt76_get_rate(mphy->dev, sband, rate_idx,
+ cck);
+ rate->legacy = sband->bitrates[rate_idx].bitrate;
break;
case MT_PHY_TYPE_HT:
case MT_PHY_TYPE_HT_GF:
|